Multiple choice

Which of the following steps is/are not involved in the primary treatment of sewage in the treatment plant?

a. Sewage is passed through coarse screens or sieves. b. The liquid is passed through a tank that removes grit and sand. c. Chlorination is done to kill the disease causing organisms.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this is done in the third stage of sewage treatment. In the third stage of primary treatment, the water is passed through the sedimentation tanks.

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